The x-ray powtler pattern of single phase $Bi_2S_2CaCu_2O_{8+x}$ has been identified and fullyindexed using a pseudotetragonal subcell with a= 5.408, c = 30.83 $AA$ and an incommensurate supercellwith reciprocal lattice vector, <TE>X$q^*$, given by $q^*=0.211b^*-c^*$. The x -ray powder pattern of the Pb-free110K superconductor phase "$Bi_2S_2CaCu_2O_{10+x}$" has many lines which belong t.o an incommensuratesupercell. Using elect.ron d~ffraction pImt.ographs as a indexing guide, an indexing scheme for the powderpattern has been obtained. The unit cell has a geometrically orthorhombic subcell a=5.411, b= 5.420, c=37.29(2) $AA$. Supercell reflections have indices that are derived from the subcell k, 1 indices by addition uf$pm q^*$, where $pm q^*=0.211b^*-0.78c^*$The incommensurate con~ponent In the b dwection, $delta$, is the same for both phases but on going from2212 to 2223 phase, the superlattic component in the c direction changes from commensurate($varepsilon$=1) toincommensurate($varepsilon$=0.78).X>$</TEX>varepsilon$</TEX>=0.78).